Default Count-Based Network Models for Credit Contagion

19 Pages Posted: 1 Apr 2020

See all articles by Arianna Agosto

Arianna Agosto

University of Pavia

Daniel Felix Ahelegbey

University of Pavia, Department of Economics and Management; Boston University, Department of Mathematics & Statistics

Date Written: January 28, 2020

Abstract

Interconnectedness between economic institution and sectors, already recognised as a trigger of the great financial crisis in 2008-2009, is assuming growing importance in financial systems. In this paper we study contagion effects between corporate sectors using financial network models, in which the significant links are identified through conditional independence testing. While the existing financial network literature is mostly focused on Gaussian processes, our approach is based on discrete data. We indeed test dependence in the conditional mean (and volatility) of default counts in different economic sector estimated from Poisson autoregressive models, and in its shocks. Our empirical application to Italian corporate defaults in the 1996-2018 period reveals evidence of a high inter-sector vulnerability, especially at the onset of the global financial crisis in 2008 and in the following years. Many contagion effects between corporate sectors are indeed found in the shock component of the default count dynamics.

Keywords: Financial networks; Inter-sector contagion; Poisson autoregressive models; Vector autoregressive models; Conditional Granger causality; PC-algorithm

JEL Classification: C01, C32, C58, G21, G32

Suggested Citation

Agosto, Arianna and Ahelegbey, Daniel Felix, Default Count-Based Network Models for Credit Contagion (January 28, 2020). Available at SSRN: https://ssrn.com/abstract=3550711 or http://dx.doi.org/10.2139/ssrn.3550711

Arianna Agosto

University of Pavia ( email )

Corso Strada Nuova, 65
27100 Pavia, 27100
Italy

Daniel Felix Ahelegbey (Contact Author)

University of Pavia, Department of Economics and Management ( email )

Via San Felice 7
Pavia, Lombardia 27100
Italy
+393888931128 (Phone)

HOME PAGE: http://sites.google.com/site/danielfelixahey/home

Boston University, Department of Mathematics & Statistics ( email )

111 Cummington Mall
Boston, MA 02215
United States

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